blockage and sees that it is a large squid-like creature. The creature electrocutes Dalkey with one of its tentacles and flies away under the propulsion of hydrium. Kate coins the term "aerozoan" for this species and observes more of them travelling the Antarctic skies. Mourning their lost member, the crew gives a night lookout shift to Matt when the Hyperion is closeby. He is unable to see it soon enough and the larger ship grazes the Sagarmatha, precluding the possibility of towing it. Kate chastises Matt for damaging the ship as their relationship continues to falter. Hal, Kate, Matt and Nadira board the Hyperion and enter the vaults using Nadira's key. They find small pieces of taxidermy, which Kate carries back to the Sagarmatha, as well as some larger ones including the intact body of a yeti. In a room called the engineerium, they find a large key-activated machine that produces heat and a glass chamber housing the limp bodies of four aerozoans. No longer hiding that he has gone into debt, Hal raids the bedroom of the frozen Theodore Grunel and blows open his safe. When Matt tries to read a set of blueprints he finds in a canister, Hal angrily objects and sends the canister into one of the ship's pneumatic tubes. With Hal consumed by his lust for gold, the others read Grunel's diary and see frequent mention of a powerful enemy named "B". They dismiss this as a product of Grunel's diseased mind. The four climb out of the hatch but its connection to the Sagarmatha breaks under the wind and they are forced to spend the night on the Hyperion while low on food and oxygen reserves. Matt tries to comfort Kate but she lashes out and reveals that she knows about him kissing Nadira. Matt apologizes and Kate refers to Hal as "a bully", leading to a reconciliation between the two. That night, the travellers learn that the machine they are using for heat is "Grunel's treasure"; a fuel cell capable of producing vast amounts of hydrium rather than gold. They realize that its design is inspired by the aerozoans in the adjacent chamber. While they search for the blueprints, one of the aerozoans comes back to life and breaks through the glass, forcing them to flee the engineerium. Before they can regroup, John Rath's airship, having pursued them all along, arrives and shoots